JPH0695273A - Image forming device - Google Patents

Abstract

PURPOSE:To provide an image forming device in which angular deviation between an optical axis and an original is prevented and the angle is adjusted, and which is provided with an original holding device produced at low cost. CONSTITUTION:The base of a light transmissive glass 106 holding the original 109 is directly supported at three points by projections 82a to 82c which are provided on an original platen 63 and whose height can be adjusted, so that the original 109 is orthogonally crossed with the optical axis Y of light irradiating the original 109. Since the glass 106 on which the original 109 is placed is directly supported, there is no factor of lowering accuracy other than the thickness accuracy of glass, and the original is supported with high accuracy and the height is easily adjusted by three-point supporting constitution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus for forming an image by exposing a photosensitive material with transmitted light or reflected light transmitted through an original, and more specifically, an original holder for holding the original in a light-transmitting manner. And a document table for moving the document to a light irradiation position integrally with the document holder.

[0002]

2. Description of the Related Art There is an image forming apparatus configured to form an image by exposing a photosensitive material with reflected light or transmitted light of light illuminating an original. Of these, image formation by transmitted light is performed. As shown in FIG. 10, the document holder 1 and the document table 2 are used. That is, the document holder 1 is configured such that the glass 4 is fixed to the central portion of the frame 3 and the document such as the negative film 5 is placed and held on the glass 4. The document table 2 is configured to be capable of reciprocating, and the document holding table 1 is placed so as to close the light transmission port 6 formed in the central portion.
When forming an image, the document table 2 is moved to position the negative film 5 so as to be orthogonal to the optical axis Y of the light emitted from the light source 7, and the light transmitted through the negative film 5 is passed through the lens 9. The light is condensed and guided to an exposure section (not shown) to expose the photosensitive material. There is also a structure in which the film 5 is sandwiched between the upper and lower sides of the film to regulate the positional deviation of the film 5.

[0003]

When an image is formed,
It is desirable to make the film 5 orthogonal to the optical axis Y,
If there is an angle deviation, the focus is out of focus and a so-called out-of-focus image is formed. The angular deviation is caused by the height error of both ends of the frame body 3, in other words, the position of the document table 2. Therefore, conventionally, the frame body 3 is made of aluminum die cast or iron so that the height difference is within a range of about 0.1 mm. However, the high-precision finishing of the frame body 3 contributes to the increase in production cost. Further, in the above configuration, the angular deviation depends on the finishing accuracy of the frame body 3, and fine adjustment cannot be performed. If fine adjustment can be performed, even if there is an accuracy error in the frame body 3, it can be adjusted so that there is no angular deviation when mounted on the image forming apparatus. However, in the past, such a fine adjustment function was not provided at all, and the production yield of the frame body 3, and hence the document holding table 1, was not good.

An object of the present invention is to provide an image forming apparatus equipped with a document holder which can prevent an angular deviation between an optical axis and a document and can adjust the angle, and which can be manufactured at low cost. .

[0005]

[Means for Solving the Problems]

(1) The object of the present invention is to place a document holder holding a document on a document table and drive the document table to move the document to the light irradiation position integrally with the document holder. In the image forming apparatus that guides the image light obtained by irradiating the original document to the exposure unit and exposes the photosensitive material in the exposure unit to form an image, the image forming apparatus is provided to place the original document in the original document holder. The image forming apparatus is characterized in that the bottom surface of the light-transmitting glass is configured to be supported at three points by the height-adjustable projections provided on the document table.

(2) The object of the present invention is to place an original holder holding an original on the original table and drive the original table to irradiate the original with the original holder with light. In the image forming apparatus, which moves the image light to the position and guides the image light obtained by irradiating the original document to the exposure unit and exposes the photosensitive material in the exposure unit to form an image, the original document holder is formed on a plate-shaped substrate. A light-transmitting glass for closing the light-transmitting port, on which the original is placed, a fixing frame that forms the same plane as the bottom surface of the light-transmitting glass around the light-transmitting glass, and the base body. A plurality of insertion holes formed so as to expose the bottom surface of the fixed frame, and the document table is provided with a height-adjustable projection that is inserted into the insertion hole and abuts the bottom surface of the fixed frame. Designed to support the entire cage at three points. It is achieved by an image forming apparatus characterized by the.

[0007]

In other words, in the configuration of (1), since the light-transmitting glass for holding the original with few errors is directly supported at three points by the height-adjustable protrusions such as screws, the original is transmitted. The light and the original can be made orthogonal to each other, and it is possible to prevent out-of-focus and poor image quality.

In the configuration of (2), a fixing frame which forms the same plane as the bottom surface of the light transmitting glass for holding the original is provided around the light transmitting glass, and a flat plate shape for fixing the light transmitting glass is provided. Since the insertion hole is formed in the base body, and the height-adjustable protrusion that is inserted into the document table on which the document holder is placed and is in contact with the bottom surface of the fixed frame is provided,
The entire document holder is supported by the bottom surface of the light-transmitting glass, and the light transmitted through the document and the document are orthogonal to each other to prevent out of focus and poor image quality.

The accuracy of supporting the original depends on the uniformity of the thickness of the light-transmitting glass and the height of the protrusions, but the accuracy of the thickness of the light-transmitting glass is extremely high. By directly supporting the light-transmitting glass on which the original is placed as described above, the flatness can be tolerated due to an error in the molding accuracy of the thickness of the light-transmitting glass, and the orthogonality between the light-transmitting glass and the optical axis is a protrusion. Since it can be adjusted by increasing or decreasing the height of the document, the document can be supported with high accuracy. Therefore, even if a document holder is manufactured by injection molding resin or the like, high precision can be obtained in the document support portion.

The processing method of the light-sensitive material in the present invention is not particularly limited, and either wet processing or dry processing may be used. Examples of the photosensitive material used in the present invention include a photothermographic material. Regarding the photothermographic material, U.S. Pat. Nos. 4,500,626 and 4,483,914,
No. 4,430,415, No. 4,503,137
JP-A-59-154445 and JP-A-59-18054.
No. 8, No. 59-165054, No. 61-88256.
No. 60-120356, No. 59-218443.
No. 61-238056 and the like.

The above-mentioned photothermographic material basically has a photosensitive silver halide, a binder, a dye-donor compound and a reducing agent (the dye-donor substance may also serve as the reducing agent) on a support. In addition, an organic silver salt and other additives can be added if necessary.

The above-mentioned photothermographic material may give a negative image or a positive image upon exposure. As a method of giving a positive image, a method of directly using a positive emulsion (a method using a nucleating agent and a light fog method) as a silver halide emulsion, a dye which emits a positive diffusible dye image Any of the methods using a donor compound can be adopted.

The image forming solvent used for diffusion transfer is, for example, water, and this water is not limited to so-called pure water, but includes water in a widely and commonly used meaning. Also,
A mixed solvent of pure water and a low boiling point solvent such as methanol, DMF, acetone or diisobutyl ketone may be used. further,
It may be a solution containing an image formation accelerator, an antifoggant, a development terminator, a hydrophilic thermal solvent and the like.

[0014]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Needless to say, the present invention is not limited to this embodiment. Figure 1
2 is a perspective view showing a configuration of a document holder and a document holder for a negative film, FIG. 2 is a perspective view showing a state where the document holder is placed on the document table, and FIG. 6 is a perspective view of a positive film, FIG. 5 is a perspective view showing the structure of a document holder for a positive film and a document table, and FIG.
Is a perspective view showing a state in which the document holder is placed on the document table,
FIG. 7 is a cross-sectional view of a main part for explaining the adjustment of the document angle deviation, and FIG. 8 is a schematic configuration diagram showing the configuration of the image forming apparatus according to the embodiment of the present invention. In the description of the embodiment, the configuration of a negative film original holding table or the like will be described with reference to FIGS. 1 to 3, and then a positive film original holding table or the like will be described with reference to FIGS. 4 to 7. The overall configuration of the image forming apparatus will be described with reference to FIG.

The basic structure of the original holding table 101 will be described. The substrate 102 and the lid 103 are configured to be openable / closable by a hinge 104, and a transparent glass is formed so as to close a light transmission port 105 formed on the substrate 102. The plate 106 is fixed, and the transparent glass plate 108 is fixed so as to close the light transmission opening 107 formed in the lid 103. A document 109 such as a negative film is sandwiched between the glass plates 106 and 108. It has become. The base 102
The lid 103 and the lid 103 are made of synthetic resin.

Further, a magnet 110 is fixed on the opening / closing side of the substrate 102, in other words, on the opposite end of the hinge 104 and on the opening / closing side of the lid 103, so that the base 102 and the lid 103 are connected as shown in FIG. When closed, the base body 102 and the lid 1
03 are in close contact with each other.

The edge portion of the light transmission port 105 formed on the substrate 102 is formed in a step shape so that the glass plate 106 can be fitted therein as shown in FIG. 3, and the glass plate 106 is stepped by the cushioning double-sided adhesive tape 111. Part or substrate 102
It is glued and fixed to. Further, the edge portion of the light transmission port 107 is also formed in a step shape so that the glass plate 108 can be fitted therein, as shown in FIG. 3, and the glass plate 108 is adhesively fixed to the step portion, that is, the lid 103 by the cushioning double-sided tape 112. Has been done.

When an image is formed, the substrate 102 and the lid 103 are opened as shown in FIG.
After the original 109 is placed on the 08, the base 102 and the lid are closed and placed on the original table 63 as shown in FIG. At this time, if the document holder 101 is tilted, the problem described in the conventional example occurs.

In the present embodiment, in order to solve the above-mentioned problem, the document table 63 is constructed as follows. That is, three screws 82a, 82b, 82c are provided around the light transmission port 81 formed on the document table 63 so that the heights thereof can be adjusted. The planting positions of the three screws 82a to 82c are set so as to directly support the glass plate 106 from a position directly below the illustrated positions Pa, Pb, and Pc shown on the glass plate 106.

Here, the support state of the document holder 101 will be described with respect to the positions of the screws 82a and 82b. As shown in FIG. Also does not hang on the base 102. Although the screw 82c is not shown, it does not hang on the base 102 like the screws 82a and 82c.
The glass 106 is directly supported.

The thickness error of the glass plate 106 itself is ± 0.0.
It can be contained in an extremely minute range of about 25 mm. Therefore, when the glass plate 106 is directly supported as in the present embodiment, there is almost no inclination of the document 109 with respect to the optical axis Y, and the image quality is poor due to the out-of-focus of the formed image or the individual difference of the document holding table 101. Can be eliminated. Also,
Since the heights of the screws 82a to 82c can be adjusted, the orthogonality with the optical axis Y can be finely adjusted if the thickness error of the glass plate 106 is large or if the screw height changes during use. it can.

As described above, the document holding table 101 for negative film
Although the configuration and operation of the document table 63 and the document table 63 have been described, a positive film is also used as a document for image formation. Positive film 3
00 is, for example, as shown in FIG.
A document holder having a structure in which the periphery of 01 is fixed by a frame body 302 such as a paper material and the shape peculiar to the color positive film 300 is taken into consideration will be described below.

Next, a document holder 201 for positive film
The basic configuration of the substrate 20 will be described with reference to FIG.
2 and the lid 203 are configured to be openable and closable by a hinge 204, and a transparent glass plate 206 is fixed so as to close the light transmission opening 205 formed on the substrate 202, and the lid 20
A transparent glass plate 208 is fixed so as to close the light transmission opening 207 formed in the third member 3, and the original 300 such as a color positive film is sandwiched between the glass plates 206 and 208. The base body 202 and the lid 203 are made of synthetic resin.

The positive film 300 has a frame 302
Is fixed, so that the color positive film 301 is directly sandwiched between the glass plates 206 and 208, the glass plates 206 and 208 are set to have a size to fit inside the frame 302 as shown in FIG. Therefore, the glass plate 20
6 is to be directly supported at three points, screws 82a to 82c
Will be hung on the color positive film 301, and a part of the image will be hidden by the screws 82a to 82c.

Therefore, in the present embodiment, the periphery of the bottom surface of the glass plate 206 is adhesively fixed to the base body 202, and the metal fixing frame 20 is extended so as to extend the bottom surface of the glass plate 206.
9 was provided. According to this configuration, the bottom surface of the fixed frame 209 is flush with the glass plate 206. And the fixed frame 20
An insertion hole 211 for inserting the screws 82a to 82c was formed in the lower part of the plate 9. The insertion hole 211 is provided with the screw 82a.
Three pieces corresponding to ~ 82c are formed, but those corresponding to the screws 82a and 82b are shown in FIG. 7.

When an image is formed using the positive film 300, the lid body 203 is opened as shown in FIG.
The positive film 300 is set so that the glass plate 206 is fitted into the inside of 2. Then, as shown in FIG. 6, the lid 203 is closed, and then the screws 82a to 82 are inserted into the insertion holes 211.
The document is placed on the original table 63 so that c is inserted. As a result, as shown in FIG. 7, the positive film 3 is formed on the light transmission port 81.
00 is positioned, and the positive film 300 is supported substantially in the same plane as the glass plate 206. Therefore, the color positive film 301 does not incline, and it is possible to prevent out-of-focus and poor image quality as described above.

Next, referring to FIG. 8, the original holding table 10 is described.
An example of an image forming apparatus to which 1 and document table 63 are applied will be described. A photosensitive material magazine 12 is arranged in the image forming apparatus 11, and a photosensitive material 14 is wound and stored in the photosensitive material magazine 12 in a roll shape. The photosensitive material 14 is
It has a photosensitive silver halide, a binder, a dye-donating substance, and a reducing agent on a support, and the dye-donating substance is transferred to the image-receiving material by heating and development in superposition with the image-receiving material. Further, the thermal phenomenon transfer process of the photosensitive material 14 is promoted in the presence of an image forming solvent such as water.

The photosensitive material 14 drawn out from the photosensitive material magazine 12 and cut into a predetermined length by the cutter 13 is conveyed to the exposure section 16. A receiving material magazine 18 is arranged below the photosensitive material magazine 12, and an image receiving material 20 is wound in a roll shape and stored in the receiving material magazine 18. On the image forming surface of the image receiving material 20,
A dye fixing material having a mordant is applied. The image receiving material 20 that has been pulled out from the receiving material magazine 18 and cut into a predetermined length by the cutter 17 is used in the heat development transfer section 2 described later.
It is designed to be transported to 9.

A platen glass 25 is provided on the upper part of the main body, and a transparent original illuminating device (proof unit) 30 described later is detachably mounted on the platen glass 25. When using a reflective original, an original cover that covers the upper surface of the original is attached. A light source unit 50 having a light source 28 and a first moving mirror 22A that moves together with the light source 28 as a reflection original illuminating device is provided directly below the platen glass 25, and a plurality of first moving mirrors 22A that can move relative to the first moving mirror 22A. Two moving mirrors 22B are provided, and both are platen glass 25.
It is possible to move along. Second moving mirror 22B
Is configured to move relative to the light source unit 50, but the amount of movement and the moving speed are 1/2 of those of the light source unit 50.
Is set to. Further, the reflected light from the document passes through the image forming lens unit 19, and is reflected by the fixed mirror 23 and the movable mirror 24 provided in the mirror unit 26, and further by the fixed mirror 27 to the exposure unit 16.

Although not shown, a photometric device for measuring the image density of the original based on the image light reflected by the movable mirror 24 is arranged near the mirror unit 26, and the photometric device is provided. The exposure conditions are determined by. Further, the mirror unit 26 is configured to move during zooming to adjust the optical path length. The movable mirror 24 moves upward in the mirror unit 26 when an image is formed by the projector 61, which will be described later.
This image light is transmitted through the fixed mirror 27. The exposure of the photosensitive material 14 is performed by moving the light source 28 and the first moving mirror 22A while moving the second moving mirror 22B at a predetermined speed, irradiating the light from the light source 28 along the original, and reflecting the light. The mirrors 22A, 22B, 2
3. Using the imaging lens unit 19, an image is formed on the photosensitive material 14 located in the exposure section 16 and scanning exposure is performed.

A transmissive light source 36 for illuminating the original on the platen glass 25 from the back side (upper side in the drawing) is provided in the transmissive original illuminating device 30, and the transmissive light source 36 is provided at the illumination position.
The light-sensitive material 14 is exposed by slit-scanning the document without turning on the light source 28 in the main body in the state of turning on. The photosensitive material 14 that has been subjected to scanning exposure in the exposure unit 16 is inverted and conveyed, and water as an image forming solvent is applied by the water application unit 38. Photosensitive material 14 coated with water by water coating section 38
Is superposed on the image receiving material 20 in the heat development transfer section 29, and heat development transfer is performed.

The heat development transfer section 29 includes a heating drum 42 containing a heating element 40 such as a halogen lamp and the endless pressure contact belt 4.
4 and. The photosensitive material 14 and the image receiving material 20 are superposed and pressed against the outer periphery of the heating drum 42 by the endless pressure contact belt 44, and are sandwiched and conveyed over the peripheral surface of the heating drum 42 in the superposed state to be thermally developed. Has become. As a result, the photosensitive material 14
Emits a mobile dye, which at the same time is transferred to the image receiving material 2
An image is obtained by being transferred to the dye fixing layer of No. 0.

The photosensitive material 14 separated from the image receiving material 20 after the heat transfer is sent to a waste photosensitive material tray 46 provided below the heat development transfer section 29. The image receiving material 20 separated from the photosensitive material 14 is
It is adapted to be accumulated in the discharge tray 48.

A projector 61 is detachably attached to the side portion of the main body 11. The projector 61 is for forming an image of a light-transmissive original, for example, the color negative film or the color positive film 301 described above as the original 109, and the color reversal film on the receiving material 20. It is composed of a document table 63 on which a transmissive document is placed and an optical system 64. In addition,
As described above, the originals 63 are provided with the screws 82a to 82c, and the originals holders 101 and 201 are placed on the screws 82a to 82c corresponding to the film on which the image is formed. Light source unit 62
A transmissive light source 71 is provided inside, and the optical system 64 is composed of a lens portion 74 including a zoom lens 72 and a diaphragm plate 73, color filters 75a and 75b, and a mirror 76.

Although the embodiments of the document holder, the document table, and the image forming apparatus have been described above, the document holder for holding the positive film may have the structure described below. FIG. 9 is a partial cross-sectional view of a modified example of the document holder, and the document holder 401 in this example has a glass plate 404 so as to close a light transmission port 403 formed in a substrate 402.
Is fixed, and a fixing frame 405 having a diameter larger than that of the base body 402 is provided so as to surround the glass plate 404. Then, the insertion hole 4 is formed in the base 401 below the fixed frame 405.
06 is formed so that the screws 82a and 82b can be inserted therethrough. Although three insertion holes 406 are formed similarly to the above, two insertion holes 406 corresponding to the screws 82a and 82b are shown in FIG. A frame body 407 made of synthetic resin is fixed to the outer periphery of the fixed frame 405, and the lid body is omitted.

Also in this structure, the bottom surface of the fixed frame 405 is substantially flush with the bottom surface of the glass plate 404. When the positive film 300 is set on the glass plate 404 and further placed on the original table 63, the screws 82a to 8a
2c comes into contact with the bottom surface of the fixed frame 405 so that the document holder 401
Therefore, it is possible to prevent out-of-focus and poor image quality as in the case of directly supporting the glass plate 404. Further, since the lid is not necessary, the structure is simple and the cost can be reduced.

[0037]

As described above, in the image forming apparatus according to the present invention, the bottom surface of the light transmitting glass for holding the original is directly supported at three points by the height adjustable projections provided on the original table, The document is configured to be orthogonal to the optical axis that illuminates the document. Further, in the image forming apparatus according to the present invention, a fixing frame that forms the same plane as the light-transmitting glass that holds the document is provided, and an insertion hole is formed in the base body that fixes the light-transmitting glass, and is formed on the document table. A height-adjustable protrusion is inserted into the insertion hole to directly support the bottom surface of the fixed frame.

Therefore, by directly supporting the light-transmitting glass holding the original or the fixed frame whose bottom surface is flush with the light-transmitting glass, there is no factor that deteriorates the supporting accuracy other than the extremely accurate thickness of the light-transmitting glass. Therefore, the document can be supported with high accuracy. Also, due to the three-point support configuration,
The height and inclination of the light transmitting glass can be easily adjusted, and the angle between the optical axis of the light transmitted through the original and the original can be surely made orthogonal. Therefore, it is possible to prevent out-of-focus and poor image quality due to the angle shift, and it is possible to perform good image formation.

[Brief description of drawings]

FIG. 1 is a perspective view showing a document holder and a document table according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a document holder is placed on a document table.

FIG. 3 is a cross-sectional view showing a state in which a document holder is placed on a document table.

FIG. 4 is a perspective view of a positive film.

FIG. 5 is a perspective view showing a document holder and a document table for a positive film.

FIG. 6 is a perspective view showing a state in which a document holder is placed on a document table.

FIG. 7 is a cross-sectional view showing a state in which a document holder is placed on a document table.

FIG. 8 is a schematic configuration diagram showing an overall configuration of an image forming apparatus.

FIG. 9 is a sectional view showing another example of a document holder for a positive film.

FIG. 10 is a sectional view showing an example of a conventional document holder.

[Explanation of symbols]

11 image forming apparatus 22A, 22B, 23, 24, 27 reflection mirror 12 photosensitive material magazine 14 photosensitive material 16 exposure section 18 receiving material magazine 20 image receiving material 30 proof unit 61 projector 63 original plate 81 transparent opening 82a to 82c screw 101, 201 , 401 document holders 102, 202, 402 bases 103, 203 lids 106, 108, 208, 209, 404 light-transmitting glass 109 documents 211 insertion holes 300 positive film

Claims (2)

[Claims] 1. A document holder that holds a document is placed on a document table, and the document table is driven to move the document to a light irradiation position integrally with the document holder to irradiate the document. In the image forming apparatus that guides the image light obtained by the above to the exposure section and exposes the photosensitive material in the exposure section to form an image, the bottom surface of the light transmitting glass provided for mounting the original in the original holder. Is configured to be supported at three points by a height-adjustable protrusion provided on the document table. 2. An original document holder holding an original document is placed on an original document table, and the original document table is driven to move the original document to a light irradiation position integrally with the original document holder to irradiate the original document. In the image forming apparatus that guides the image light obtained by the above to the exposure unit and exposes the photosensitive material in the exposure unit to form an image, the document holder is configured to block the light transmission port formed in the plate-shaped substrate. A light-transmitting glass for mounting the original document, a fixing frame that forms the same plane as the bottom surface of the light-transmitting glass around the light-transmitting glass, and a bottom surface of the fixing frame exposed to the base. A plurality of insertion holes formed in the document table, and the document table supports the whole document holder at three points by height-adjustable protrusions that are inserted into the insertion holes and abut against the bottom surface of the fixed frame. Image formation characterized by being configured into apparatus.